(FT/P5-23) Transport and Stability Study of a Fusion Power Plant Scenario

G.V. Pereverzev1), E. Strumberger1), S. Guenter1), K. Lackner1)
1) Max Planck Institute für Plasma Physics, Garching, Germany

Abstract.  Confinement and stability properties of plasmas in a fusion power plant have been studied for both pulsed and steady state modes of operation. The transport analysis is based on the first principle transport models. Stability analysis has been performed for ideal and resistive modes with account of ideally conductive and resistive wall stabilization. It has been found that predictions for a conventional pulsed scenario are quite conservative and either lead to a large-size device or require high pedestal temperature. These requirements can be relaxed if an advanced scenario with a reversed shear is considered. In this scenario, first a reversed shear configuration is created by an external off-axis current drive and then an internal transport barrier (ITB) is formed. The bootstrap current driven in the ITB causes extention of the reversed shear zone with subsequent broadening of the ITB and further increase of the bootstrap fraction. A feedback control algorithm is proposed that prevents uncontrollable bootstrap growth and stabilizes it at a prescribed level. The process opens a route to a high-performance regime with steady state operation. The conditions for appearance and stability of this non-inductive scenario will be explored.

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